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- package subprotocols;
- import java.security.SecureRandom;
- import communication.Communication;
- import crypto.Crypto;
- import exceptions.NoSuchPartyException;
- import oram.Forest;
- import oram.Metadata;
- import protocols.Protocol;
- import struct.Party;
- import util.M;
- import util.Util;
- public class SSPIR extends Protocol {
- SecureRandom sr1;
- SecureRandom sr2;
- public SSPIR(Communication con1, Communication con2) {
- super(con1, con2);
- }
- public SSPIR(Communication con1, Communication con2, SecureRandom sr1, SecureRandom sr2) {
- super(con1, con2);
- this.sr1 = sr1;
- this.sr2 = sr2;
- }
- public void reinit(Communication con1, Communication con2, SecureRandom sr1, SecureRandom sr2) {
- this.con1 = con1;
- this.con2 = con2;
- this.sr1 = sr1;
- this.sr2 = sr2;
- }
- public byte[] runP1(byte[][] x) {
- timer.start(M.offline_comp);
- int l = x.length;
- int m = x[0].length;
- byte[] a1 = new byte[l];
- byte[] r = new byte[m];
- sr2.nextBytes(a1);
- sr1.nextBytes(r);
- timer.stop(M.offline_comp);
- // ----------------------------------------- //
- timer.start(M.online_comp);
- byte[] z = Util.xorSelect(x, a1);
- Util.setXor(z, r);
- timer.stop(M.online_comp);
- return z;
- }
- public byte[] runP2(byte[][] x) {
- timer.start(M.offline_comp);
- int m = x[0].length;
- byte[] r = new byte[m];
- sr1.nextBytes(r);
- timer.stop(M.offline_comp);
- // ----------------------------------------- //
- timer.start(M.online_comp);
- timer.start(M.online_read);
- byte[] a2 = con2.readAndDec();
- timer.stop(M.online_read);
- byte[] z = Util.xorSelect(x, a2);
- Util.setXor(z, r);
- timer.stop(M.online_comp);
- return z;
- }
- public void runP3(int l, int t) {
- timer.start(M.offline_comp);
- byte[] a = new byte[l];
- sr1.nextBytes(a);
- timer.stop(M.offline_comp);
- // ----------------------------------------- //
- timer.start(M.online_comp);
- a[t] = (byte) (a[t] ^ 1);
- timer.start(M.online_write);
- con2.write(online_band, a);
- timer.stop(M.online_write);
- timer.stop(M.online_comp);
- }
- @Override
- public void run(Party party, Metadata md, Forest[] forest) {
- for (int j = 0; j < 100; j++) {
- int l = 100;
- int m = 50;
- byte[][] x = new byte[l][m];
- for (int i = 0; i < l; i++) {
- Crypto.sr.nextBytes(x[i]);
- }
- if (party == Party.Eddie) {
- this.reinit(con1, con2, Crypto.sr_DE, Crypto.sr_CE);
- con1.write(x);
- byte[] out = this.runP1(x);
- con2.write(out);
- con2.write(x);
- } else if (party == Party.Debbie) {
- this.reinit(con1, con2, Crypto.sr_DE, Crypto.sr_CD);
- x = con1.readDoubleByteArray();
- byte[] out = this.runP2(x);
- con2.write(out);
- } else if (party == Party.Charlie) {
- this.reinit(con1, con2, Crypto.sr_CE, Crypto.sr_CD);
- int index = Crypto.sr.nextInt(l);
- this.runP3(l, index);
- byte[] out1 = con1.read();
- x = con1.readDoubleByteArray();
- byte[] out2 = con2.read();
- Util.setXor(out1, out2);
- if (!Util.equal(out1, x[index]))
- System.err.println(j + ": SSPIR test failed");
- else
- System.out.println(j + ": SSPIR test passed");
- } else {
- throw new NoSuchPartyException(party + "");
- }
- }
- }
- @Override
- public void run(Party party, Metadata md, Forest forest) {
- }
- }
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